If you have a friend or family member who is at risk for delirium, you can do things to help. There is no guarantee that these measures will prevent delirium. Delirium is not preventable in more than 50% of people. That’s because sometimes delirium results from infections, medicines, or other causes that a healthcare provider must address. But they may reduce risk. It may take days, weeks, or even months for delirium to go away, so prevention is important. In some cases, a person may not fully recover.